Beam (Erlang)

This section is specific to Beam (Erlang) targeting. It will guide you through the process of setting up your project and using Fable to compile F# to Erlang.

Prerequisites#

You need Erlang/OTP 25 or higher and rebar3 installed. Verify with:

erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().' -noshell
rebar3 version

• Compile your project to Erlang:

  dotnet fable --lang beam

  Fable generates .erl files in src/ subdirectories and automatically creates a rebar3 project scaffold (rebar.config, .app.src files).

• Compile the generated Erlang files with rebar3:

  rebar3 compile

• Run your code:

  erl -noshell -pa _build/default/lib/*/ebin -eval 'program:main(), halt().'

• Run Fable in watch mode for development:

  dotnet fable watch --lang beam

For more details, see Build and Run.